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Orientador(es)
Resumo(s)
In this study, Pinus pinea seedlings mycorrhized with selected ectomycorrhizal fungi (ECMF), Pisolithus
tinctorius and Suillus bellinii, were exposed to the herbicide benfluralin. Non-mycorrhized P. pinea seedlings
and seedlings mycorrhized with ECMF were transferred to benfluralin-spiked soils at levels of
0.165, 1.65 and 16.5 mg kg 1. Plant growth and the fungal role on plant antioxidant response were
assessed. In the presence of benfluralin, higher plant growth was observed in mycorrhized plants compared
to non-mycorrhized plants, but ECMF colonisation and nutrient uptake were affected by the herbicide.
Benfluralin showed no effect on lipid peroxidation in P. pinea seedlings. However, seedlings
mycorrhized with S. bellinii showed higher levels of lipid peroxidation when compared to non-mycorrhized
ones, both in the presence and absence of benfluralin. The increase of lipid peroxidation could be
related to seedling growth induced by the fungus and not to benfluralin toxicity. A similar trend was
observed in seedlings mycorrhized with P. tinctorius when exposed to higher benfluralin concentrations,
suggesting that the antioxidant response to benfluralin is related not only to fungus species, but also to
the level of stress applied in the soil. The higher amount of superoxide dismutase activity in P. pinea seedlings
tissues exposed to benfluralin could indicate a plant adaptative response to benfluralin toxicity. Catalase
activity showed no increase with benfluralin exposure. Pre-established P. tinctorius mycorrhization
conferred root protection and enhanced plant growth in benfluralin spiked soil, inferring that P. tinctorius
– P. pinea association could advantageous for plant growth in soils contaminated with pesticides
Descrição
Palavras-chave
Pinus pinea Pisolithus tinctorius Suillus bellinii Catalase Superoxide dismutase Lipid peroxidation
Contexto Educativo
Citação
FRANCO, AR; PEREIRA, Sofia I. A.; CASTRO, Paula M.L. - Effect of benfluralin on Pinus pinea seedlings mycorrhized with Pisolithus tinctorius and Suillus bellinii – Study of plant antioxidant response. Chemosphere. ISSN 0045-6535. Vol. 120 (2015), 422–430
Editora
Elsevier